JavaBean List Map Json的转化

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1、依赖的包

根据：http://json-lib.sourceforge.net/ 可见json-lib使用需要依赖一下包：

下载地址：http://download.csdn.net/download/zfxinli/2117292 或百度盘：http://pan.baidu.com/s/1hq5kGQC

非常有用的参考：

（1）json在线转换器：http://json.parser.online.fr/

（2）json介绍：http://www.json.org/json-zh.html

2、普通JavaBean

（1）基本JavaBean

public class User {    private String username;    private String password;        public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

（2）转化成JSONArray

User user = new User();user.setUsername("lp");user.setPassword("1234");JSONArray json = JSONArray.fromObject(user);System.out.println(json);//结果：[{"password":"1234","username":"lp"}]

（3）转化成JSONObject

User user = new User();user.setUsername("lp");user.setPassword("1234");JSONObject json = JSONObject.fromObject(user);System.out.println(json);//结果;{"password":"1234","username":"lp"}

3、List<User>

（1）转化成JSONArray

List<User>users = new ArrayList<>();User user = new User();user.setUsername("lp");user.setPassword("1234");User userSecond = new User();userSecond.setUsername("ch");userSecond.setPassword("4567");users.add(user);users.add(userSecond);JSONArray json = JSONArray.fromObject(users);System.out.println(json);//结果：[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}]

（2）转化成JSONObject

不可以直接通过JSONObject jsonObj = JSONObject.fromObject(users);进行

可以通过如下方式：

JSONObject json = new JSONObject();json.put("users", users);json.put("userSecond", userSecond);System.out.println(json);//结果：{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"userSecond":{"password":"4567","username":"ch"}}

4、Map

（1）转化成JSONArray

Map<String, Object>map = new HashMap<String, Object>();map.put("users", users);map.put("user", user);JSONArray json = JSONArray.fromObject(map);System.out.println(json);//结果：[{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"user":{"password":"1234","username":"lp"}}]

（2）转化成JSONObject

Map<String, Object>map = new HashMap<String, Object>();map.put("users", users);map.put("user", user);JSONObject json = JSONObject.fromObject(map);System.out.println(json);//结果：{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"user":{"password":"1234","username":"lp"}}

来源：http://blog.sina.com.cn/s/blog_a15aa56901017i2x.html

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